1.
I uninstalled 8.1.3-1 and tried to reinstall 8.1.12-1 via storeman. Did not work.

2.
Now downloaded the file "aliendalvik-control-8.1.12-1.armv7hl.rpm" via openrepos and tried to install it manually. Does not work with the following error message.
"Nothing provides aliendalvik >=8.1.0.46.17 which is required by aliendalvik-control-8.1.12-1.armv7hl."

3.
Installation of 8.1.3-1 works without problems

I am using SFOS 3.0.1.14 on the Xperia XA2.
Can it be that aliendalvik-control-8.1.12-1 only runs on SFOS 3.0.2? Maybe the problem is with storeman?